Improvement in flasks for casting stamp-shoes for crushing-mills



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HENRY BOLTHOFF,v OE CENTRAL CITY, COLORADO TERRITORY.

Letters Patent No. 108,556, dated october 25, 1870.

IMPRovEMEN'r lN FLAsKs Fon CASTING STAMP-SHOES Fon cRusl-uNG-MILLS.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom it may concern Be it known that I, HENRY BoLTHoFF, of Cen.-tral City, Gilpin County, Colorado Territory, have invented a new andImproved.MoldingFlask for the Manufacture of Stamp-Shoes and Dies forStamps or f Crushing-Mills, by means of Screw-Pressure; and I do herebydeclare that the following is a tiill and exact description thereof',reference being had to the accompanying drawings,and to the letters ofreference marked thereon.- p

The nature of my invention consists in exerting screw-pressure upon theiron when in a molten state,

by means of a screw, as shown at A in the accompanying-drawings. Thispressure is continued until the iron becomes chilled or hard.

By means of this pressure, the iron of the shoe or die is rendered muchmore dense and durable than by packed with sand, representedby D, whichsand serves the double'purpose of supporting the cover C when thepattern is withdrawn, and also for faeilitatin g the removal of the shoeor die when cast.

The upper portion, E, of the flask is secured to the .the neck of theshoe, to any length required.

lower-'portion `or chill, F, ot' the flask, by means of the key at I. Y

G is a movable plug, which can be easily raised or lowered for thepurpose of lengthening or shorte'rlxilng ns plug is fastened at anygiven point, by means of a thumb-screw, v

The iron is poured into the tlask through the groove or spout at K t Onthe under side of the cover C, and at D, by refereneeto the drawings, isa teat, or prominence, which is designed to produce a concave on thebottom of the shoe, which will prevent the shoe from wearing to apointwhen placed on an old die having an irregular surface.

A shoe manufactured in this tiask will be perfectly smooth and regularin form, making it easily and perfectly adjustable to the stern, thusdiminishing the' liability of breaking on account of imperfectadjustnient. Besides, these shoes and dies will wear nearly twice aslong as the ordinary shoes and dies on account of the greater densitygiven to the iron by screwpressure exerted in the manner abovedescribed.

\Vh4at I claim` as my invention, and desire to secure by Letters Patent,is-l A flask, constructed and arranged as described. AWitnesess: HENRYBOLTHOFF.

WESLEY CEITGHEL, JOSEPH W. KENNEDY.

